CNBC Daily Open: U.K.'s Keir Starmer on the verge of quitting

British Prime Minister Sir Keir Starmer hosts the first roundtable of regional English mayors with Andy Burnham (R) Mayor of Greater Manchester, at Downing Street on July 9, 2024 in London, England. Ian Vogler | WPA Pool | Getty Images Hello, this is Leonie Kidd writing to you from London. Welcome to today's edition of the Daily Open newsletter. Monday is barely underway in London, and already there is a lot for investors to digest. The pressure on British Prime Minister Keir Starmer to map out his departure is growing, from within his own party — and from U.S. President Donald Trump. Meanwhile, negotiators have agreed to a 60-day roadmap for an Iran peace deal, a remarkable feat after a weekend of threats from both sides. What you need to know today Lake Lucerne in Switzerland hosted the latest round of negotiations between the U.S. and Iran this weekend, leading to the agreement of a 60-day roadmap to a final peace deal. "The Lake Lucerne Summit was conducted in a positive and constructive atmosphere. Encouraging progress has been made, including the creation of a mechanism for further technical talks," according to a joint statement by mediating parties Qatar and Pakistan. It's a remarkable outcome after the weekend saw an escalation in tensions. On Saturday, Iran threatened to close the Strait of Hormuz and boycott talks, while U.S. …